Purchase-change device



Aug. 31, 1965 WRIGHT, JR 3,204,131

PURCHASE-CHANGE DEVICE Filed Feb. 24, 1961 2 Sheets-Sheet 1 INVENTOR.Joseph E Wn'g/z/ Jr. BY

Aug. 31, 1965 J. E. WRIGHT, JR 3,204,131

PURCHASE-CHANGE DEVICE Filed Feb. 24, 1961 2 Sheets-Sheet 2 UnitedStates Patent 3,204,131 PURCHASE-CHANGE DEVICE Joseph E. Wright, Jr.,Rockford, Ill., assignor, by mesne assignments, to Reed ElectromechCorporation, Rockford, 'III., a corporation of Delaware Filed Feb. 24,1961, Ser. No. 91,538

i 17 Claims. (Cl. 307-112) This invention relates in general to driveapparatus and release arrangements therefor and more particularly to adrive and release arrangement for a coin changer which is in part undercontrol of apparatus positioned in accordance with a coin deposit.

The circumstances under which the present invention arose were foundedin an improved coin change apparatus of the type disclosed in PatentsNos. 2,459,008 and 2,923,165 granted Tratsch and Patzer respectively andan article entitled Change-Maker with a Magic Brain appearing in thepublication Metal Products Manufacturing in May, 1958. The coin changeapparatus referred to comprised a stepping mechanism operated to aposition dependent on a coin deposit in an automatic vending machine fortotalizing the deposit together with circuits and apparatus forsequentially testing the deposit against the value of an article to bevended. On each test a predetermined coin payout was made if the amountdeposited exceeded the cost of the article.

Previous coin change apparatus had permitted the automatic vending ofarticles having respective values and the making of change responsiveonly to predetermined coin deposits. In the improved coin changeapparatus, however, it was possible to automatically vend articles ofconsiderable difference in value responsive to deposits of considerablevariance in value.

, Thus in the improved change apparatus the stepping mechanism wasoperated to position a pair of contact brushes in accordance with thevalue of the total coin deposit. One of the brushes was part of a seriesof spaced apart brushes which were simultaneously stepped to respectivepositions representing consecutively lower values. Either the one brushor one of its spaced apart series thus was placed in a position whichrepresented the value of the article to be vended. Responsive to theselection of the desired article a coin payout drive or coin controlapparatus stepped the other of said pair of brushes back to testrespective ones of said series of brushes successively. After each test,a coin of predetermined denomination was paid out, until the position ofthe other or test brush corresponded to the value of the selectedarticle to be vended. The article was then vended, or dispensed, and theentire stepping arrangement, including the brushes, was returned to itsoriginal or normal position.

The requirement that a brush be stepped independently by either thestepping mechanism or the coin payout drive and that it be steppedselectively both with and without the others, created a number ofcomplications in that the separate drives and associated apparatus hadto be selectively interconnected with the brush. But this was onlyoneafacet of the problem in that the release of such apparatus eitherrequires that separate release arrangements be provided, which is bothexpensive and difficult to synchronize, or that an excessive load bethrown on the release arrangement normally provided for the steppingmechanism.

This invention eliminates the release problem, while still providing allrequired brush functions. In essence this is done by utilizing a cam orlever which on rotation in one direction moves a drive clutch axiallyinto engage- .ment with the test brush while a spring located betweenthe drive clutch and test brush aids in the proper engagement thereof.Thereafter a momentary'rotational impulse in the opposite directiontransmitted on the test brush being moved to a position corresponding tothe article value permits the spring to axiallyretract the clutch fromthe test brush and immediately reset the drive.

It is, therefore, an object of this invention to provide a simpleeconomical release arrangement for a drive apparatus.

It is a further object of this invention to provide a releasearrangement for a coin change apparatus, which in part functions to aidin the engagement of said change apparatus with a selectively drivencomponent.

It is still another object of this invention to provide a coin payoutdrive arrangement which is selectively engaged for rotating a test brushresponsive to the axial movement of said drive in one direction and isdisengaged therefrom by axial movement in another direction.

A further object of this invention'is the provision of an improved driveand release apparatus for a coin changer.

A still further object of this invention is the provision of a coinchange or payout comparison test drive which is rotated in one directionto make said test and is released by movement along its rotational axisresponsive to an external rotational impulse in the same direction.

With the foregoing and other objects in view which will appear as thedescription proceeds, the invention consists of certain novel featuresof construction, arrangement and a combination of parts hereinafter morefully described, illustrated in the accompanying drawings, andparticularly pointed out in the appended claims, it being understoodthat various changes in the form or arrangement and minor details of thestructure may be made without departing from the spirit or sacrificingany of the advantages of the invention.

For the purpose of facilitating an understanding of this invention,there is illustrated in the accompanying drawings a preferred embodimentthereof, from an inspection of which, when considered in connection withthe following description, this invention, its mode of construction,assembly and operation, and many of its advantages should be readilyunderstood and appreciated.

FIG. 1 illustrates the general assembly of the coin deposit totallingand coin payout drive;

FIG. 2 illustrates the important components of FIG. 1 in greater detailwhereby their relationship may be more easily ascertained;

FIG. 3 is a perspective illustration of various components of the coinpayout drive arrangement to show their axial relationship; and

FIGS. 4 and 5 are respective side and front views of the drive cammingelement.

Referring now to FIG. 1, the general assembly of the totalizingarrangement and change payout or control apparatus may be seen. Thatarrangement comprises a stepping and reset assembly indicated at 10 forstepping a series of spaced apart brushes, one of which is indicated at45, and a testing brush indicated at 48 to a position corresponding tothe deposit in the vending machine. Commutator or rotor brushes areindicated at 44 and 49 respectively for establishing electricalconnections to the respective brushes as may be seen from theaforementioned article.

The change control apparatus comprises the motor indicated at 81together with the drive clutch 70 and the driven clutch 52. The latterare opera-ted by the motor 81 after brushes 45 and 48 are stepped to aposition corresponding to the deposit to move the brush 48 back to becompared with the position of the spaced apart brushes 45. A coin ofpredetermined denomination may be paid out for each step back. Whenbrush 48 moves back into a position corresponding to the price of thearticle to be vended, coin payout is terminated and the article isdispensed or vended. Thereafter all apparatus is returned to normal andit is at this time that the reset arrangement comprising the presentinvention and indicated generally at 50 is effective.

The stepping assembly comprises a 25 solenoid 12, a dime solenoid 14 anda nickel solenoid (not shown), the latter being located behind thesolenoid 12 as viewed in FIG. 1. Each is energized only responsive tothe deposit of coins of respective denomination for rotating thestepping pawl 22 a distance individually corresponding to the energizedsolenoid to totalize the deposit.

The solenoids 12 and 14, etc., together with the plug assembly 36 forestablishing connections thereto and to other circuit components (notshown) are appropriately mounted on the bracket 16 and the right anglebrackets 13 and 17 carried thereby are used for suitable support.Bracket 16 also carries at its upper end a substantially L shapedbracket 18 whose long leg 19 is arranged parallel to bracket 16 and eachis provided with an aligned aperture for rotatably supporting the shaft20. Details of the arrangements of the components and apparatus alongshaft 20 are also seen in FIG. .2.

The shaft 20 carries the ratchet 21 which is adapted to be engaged bypawl 22 and to be stepped in acoordance with the movement of pawl 22.The pawl 22 is pivotally carried by an arm 23 which is only seen endwisein FIGS. 1 and 2 and which in turn is carried by the substantially Ushaped bracket 25. The bracket 25 is in turn adapted to rotate aboutshaft 20 and as indicated in FIG. 2 to be engaged at either arms 28 or29 by the respective solenoids 12 and 14, etc., for rotation about shaft20. Spring 27 biases pawl 22 toward engagement with the ratchet 21 whilespring 26 mounted between post 30 carried by bracket 25 and post 31carried by bracket 16, biases the bracket 25' for rotation in aclockwise direction as viewed from the right of FIGURE 2. In addition alever arm 33 is seen whose use as explained in the aforementioned secondpatent (2,923,165) ensures a proper release operation of the ratchet 21and attendant apparatus on completion of the vend operation. The ratchet21 and the shaft 20, of course, are movable in a counter-clockwisedirection as viewed from the right of FIGURE 2 under the impetus of thesolenoids acting through the bracket 25 and the pawl 22 and are biasedin a clockwise direction by a flat coil spring indicated at 32 in FIG.2. The ratchet is adapted to be held in any position to which it isstepped by an escapement pawl and other apparatus -(not shown) as it isdisposed behind the ratchet 21 and attendent apparatus, but seen anddescribed in the aforementioned patents and article.

Also carried by shaft 20 is the commutator 42 which in turn carries thebrushes 44 and 45. Brush 45 is intended to illustrate one of a pluralityof spaced apart brushes each adapted to make contact wit-h respectiveprinted circuit terminals distributed in an arc about bracket 46 andeach representing a different monetary value in predeterminedincrements. By way of example, the brush 45 may be one of several whichare spacedly attached together. In addition a common terminal isprovided for brush 44 to feed current from or to any one of the brushessuch as 45. Bracket 46 is suitably supported on bracket 16 and spacedtherefrom by the spacer elements 38. It also carries terminals 39 towhich external circuits are extended from and to the printed circuitcontacts. On the other side of bracket 46 other printed circuitterminals are provided through to which brush 48 extends respectiveconnections to or from the common rotor brush 49. External connectionsare made to this side of bracket 48 at the terminals likewise indicatedat 39.

The brushes 48 and 49 are carried by a driven clutch member 52 rotatablymounted on shaft 20. The clutch 52 is provided with a wall 53perpendicular to the axis of shaft 20' as best seen in FIG. 3, and itcarries a toothed peripheral flanges 54. The wall 53 has protrudingtherefrom in the direction of commutator 42 a pair of spaced apart posts55 for engaging the brushes 48 and 49 and having therebetween a coiledtorsion spring 57 that surrounds the hub element 59 formed on wall 53 asseen in FIG. 2. One end of the torsion spring 57 is affixed to one ofthe projections 60 while the other end of the spring is affixed to oneof the posts 55. The hub element 59 nests in the central recess formedby projections 60 on the commutator 42.

The posts 55 normally abut one side of the respective projections 60formed on the commutator 42. The posts 55 are biased into engagementwith the respective projections 60 by the spring 57. When commutator 42is rotated under control of shaft 20 this motion is transmitted from theprojections 60 through the spring 57 to the posts 55 for moving thedriven clutch 52 and the brushes 48 and 49 correspondingly without play.It can, therefore, be seen that as the shaft 20 turns in acounter-clockwise direction (as viewed from the right side of FIGURE 3)the driven clutch 52 moves in a like direction but that the drivenclutch 52 is capable of in dependent movement in the opposite directionagainst the torsion spring 57 since the posts 55 are located on theclockwise side of the projections 60. Hence, the peripheral distancebetween the sides of projections 60 limits the amount of independentrotation of driven clutch 52.

Adapted to engage with but normally separated from the driven clutch 52is the drive clutch 70. The drive clutch 70 is rotatably carried by acamming element 72 which in turn is adapted to be rotated by shaft 66 asmay be seen from the arrangement in FIG. 3. Shaft 66 in turn is adaptedto be rotated by motor 81 through an appropriate gear train and theassembly of motor 81, cam 72 and drive clutch 70 is carried by bracket90. The bracket 90 in turn is carried by and appropriately spaced frombrackets 46 and 16 by screws 92 and spacers 94.

The drive clutch member 70 is likewise provided with a wall 74perpendicular to the axis of shaft 66. From this wall a toothedperipheral flange 78 is provided whose teeth are adapted to engage withthe teeth in flange 54. As seen in FIG. 2 wall 74 and flange 78 arenormally urged away from clutch 52 (toward the left side of FIG- URE 2)by the compression spring 82 which is suitably restrained by therelatively fixed washer and clamp indicated at 83 and 84 respectively onthe end of hub 85. This hub 85 is formed on the camming element 72 androtatably supports the drive clutch 70.

On the side of wall 74 that faces camming element 72 a series of threeprotruding U or V shaped walls 80 are provided whose legs intercept andend at the peripheral of wall 74. The walls 80 normally rest against theflat wall 86 of camming element 72 and as the camming element 72 is ofsmaller radius than the clutch 80, each wall 80 protrudes beyond theperiphery of element 72. This enables certain of the walls 80 to engagewith certain spaced apart stops 89 carried by the bracket 90. Threestops 89 are provided each being carried by bracket 90 at approximately120 apart.

Thus normally compression spring 82 retains drive clutch 70 out ofengagement with driven clutch 52 and maintains it in engagement withcamming element 72. Walls 80 are then seated against flat wall 86 of thecam or camming element 72. Cam 72 also carries a series of spaced apartwedges or lever walls 96 each normally nesting between a-separate pairof walls 80 on clutch 70. Walls 96 each have one face perpendicular tothe wall 86, however, the opposite face 98 slopes out from wall 86 at anacute angle therefrom. A step or somewhat flat portion 99 of theapproximate width of wall 80 is formed in face 98 to provide a supportsurface for wall 80. Step 99 is then extended to form an inclined face97 substantially parallel to face 98, and as may be already seen hefaces 97 and 98 act as a lever in moving the clutch 70 along the axis ofshaft 66.

When camming element 72 and clutch 70 are rotated in a clockwisedirection (as viewed from the right side of FIGURE 3), the stops 98 onbracket 90 each engage one of the legs of the U shaped walls 80 toprevent further rotation of clutch 70 on the hub 85. Thereafter as cam72 continues to rotate face 98 acts as a lever against the other leg ofeach U shaped wall 80 to move the drive clutch 70 parallel to the axesof aligned shafts 66 and 20 against the pressure of compression spring82. That leg of wall 80 thereafter engages the step 99, which is atslightly below the level of stop 89 and therefore wall 80 continues tomove for a slight distance up face 97 which parallels the slope of face98 when wall 80 engages stop 89. It is then raised to the level of stop89 whereafter face 97 acts to rotate the clutch 78 across the top ofstop 89. Pressure of compression spring 82 then forces clutch 70 backdown face 97 but as wall 80 is then aligned with step 99 it engagestherewith and is restrained from further movement along the axis ofshaft 66. At that time wall 80 and clutch 70 are firmly seated againststep 99 by the pressure of compression spring 82. As the walls 80 movealong the face 98 of camming element 72 onto the step 99 the teeth onflange 78 engage the teeth on driven clutch 52 against the pressure oftorsion spring 57. It can, therefore, be seen that when the walls 80 arein contact with the step 99 on camming element 72, that the cammingelement 72, driving clutch 70 and driven clutch 52 are in operativeengagement with one another and rotatable in a clockwise direction asviewed from the right of FIGURE 3.

In operation a deposit is made of coins of various denominationcorresponding to or of greater value than the article to be vended. The25 solenoid 12, the solenoid 14 and the nickel solenoid (not shown) areoperated either alone or successively dependent on the number and valueof coins deposited. Each operates the bracket 25 through an angulardisplacement corresponding to the operated solenoid so that pawl 22drives the ratchet 21 counter-clockwise (as viewed from the right ofFIGURE 1) through a corresponding arc. As ratchet 21 rotates, shaft 20is likewise rotated in a similar direction, and it drives the series offive brushes such as 45 to a corresponding position, wherein the fivebrushes make contact with corresponding. printed circuit terminals onbracket 46. Likewise driven clutch 52 and brush 48 are rotated throughthe spring 57 in a similar direction to make contact with a printedcircuit terminal on its side of bracket 46. The first of the fivebrushes such as 45 and brush 48 come to rest at a position correspondingto the value of the total deposit, and thereafter the person desiring aparticular article operates a key corresponding to that article. Acircuit is then completed for initiating coin payout if the deposit wasof greater value than the article to be dispensed. At such time motor 81is energized.

As the energized motor 81 rotates shaft 66, cam 72 is rotated togetherwith drive clutch 70. Wall 80 on clutch 70 is moved against one of thestops 89 and as cam 72 continues to rotate face 98 on lever wall 96lifts clutch 70 axially against the pressure of spring 82 so that wall80 rests upon step 99 to thereby cause the teeth on the driving anddriven clutches to engage.

Wall 80 and clutch 70 thereafter ride over step 99 and part way up face97. As clutch 70 rides up face 97 it is disengaged from stop 89 and face97 now rotatably urges the wall 80 past stop 89, whereafter it dropsback to and engages with step 99 under pressure of spring 82. The clutch70 is thereafter rotatably carried by cam 72. Ordinarily only one stopwill be engaged since this amount of rotation in the embodiment shownenables the brush 48 to pass over all of the spaced apart brushes 45. Inthis connection, it must also be remembered that independent rotation ofdriven clutch 52 is limited to the peripheral distance betweenprojections 60 since the posts 55 are positioned between theprojections. In any event, this independent rotation of clutch 52 withrespect to shaft 20 must be enough to permit the brush 48 to contact allof the contacts which are engaged by the brushes 45. In the meantime theteeth on drive clutch 70 engage the teeth on driven clutch 52, andclutch 52 is rotated therewith. As posts 55 are now being driven awayfrom projections 60, the driven clutch 52 and brushes 48 and 49 arerotated without moving commutator 42 and its brushes 45. As brush 48rotates back, it successively makes contact with the contact that eachone of the brushes 45 is engaging to thereby make a comparison with adifferent one of the spaced apart brushes 45. Each time brush 48 makescontact with one of the contacts associated with one of the brushes 45,there is completed a circuit for dispensing a nickel, for example, in awell known manner until brush 48 corresponds to one of the brushes 45which is in a position corresponding to the value of the article to bedispensed. Further coin dispensing and operation of motor 81 are thenterminated. The article is then dispensed instead and a circuitcompleted for enabling restoration of the stepping assembly 10 includingratchet 21 and shaft 20 under control of spring 22.

When the commutator 42 is rotated back towards normal, as aresult of therelease of the escapement pawl projection 60 engages post 55 and thusurges clutch 53 in the normal direction (clockwise as viewed from theright of FIGURE 3). This action moves wall off of the step 99 whereuponcompression spring 82 operates to disengage the clutch. This lets thecommutator return to zero under the impetus of flat coil spring 32(FIGURE 1). Then spring 82 drives clutch 70 back toward wall 86 alongface 98 and when wall 80 engages wall 86 further movement is terminatedand the change control or payout apparatus is now ready for anothercycle.

In accordance with the above there has been shown and described herein anovel, useful and simple arrangement for automatically engaging andresetting an auxiliary drive arrangement the latter responsive to onlyan initial impulse transmitted pursuant to the resetting of a primarydrive arrangement, but the particular embodiments or forms of theinvention described herein are not limitations upon other manners ofpracticing the invention.

I claim:

1. A coin changer for use in driving a test brush structure which ispositioned in accordance with the amount of coin deposited in a vendingmachine, comprising a drive clutch mounted for rotational movement aboutan axis, means for moving said drive clutch in one direction along saidaxis into operational engagement with said test brush structure forrotational movement therewith in one direction, and means responsive toseparate actuation of said test brush structure in rotational movementfor displacement of the clutch axially in the opposite direction todisengage the clutch from operational engagement with said test brushstructure.

2. The arrangement claimed in claim 1 in which a camming element isprovided for rotating said clutch in one direction.

3. The arrangement claimed in claim 2 in which said camming element isrotated by a coin payout control motor.

4. The arrangement claimed in claim 1 in which spring means as providedfor driving said test brush structure in another direction to rotatesaid clutch in said other direction.

5. A coin change ascertainment arrangement for use in driving a testbrush structure which is positioned in accordance with a coin deposit ina vending machine, comprising a drive clutch mounted for rotation on oneaxis, means for moving said drive clutch along said axis for engagingsaid test brush structure responsive to rotation of said clutch in onedirection, means for thereafter holding said clutch engaged while saidclutch and brush structure are rotated, means for rotating said testbrush structure in the opposite direction, and means responsive tomovement of the test brush structure in said opposite direction fordisplacement of the clutch axial-1y in the opposite direction todisengage the clutch and brush struc ture.

6. The arrangement claimed in claim 5 in which said means moving saidclutch into engagement comprises rotating means for rotating saidclutch, a stationary stop for terminating the rotation of said clutch,and a lever wall carried by said rotating means thereafter engaged withsaid clutch for moving said clutch axially.

7. The combination claimed in claim 6 in which said clutch is disengagedby said lever wall from said stationary stop responsive to said axialmovement.

8. The arrangement claimed in claim 6 in which said lever wall has aplatform upon which said clutch is engaged responsive to said axialmovement.

9. In the arrangement claimed in claim 8, means for normally urging saidclutch into engagement with said platform.

10. The arrangement claimed in claim 8 in which said lever wall platformcarries said clutch for rotation about the axis of said clutch.

11. The arrangement claimed in claim 5 in which said means for axialdisplacement of said clutch in the opposite direction comprises a springnormally urging said clutch out of engagement with said test brushstructure.

12. The arrangement claimed in claim 11 in which said spring is mountedaxially with said clutch.

13. In the arrangement claimed in claim 6, means for biasing said testbrush structure for rotation in said other direction.

14. A coin change ascertainment arrangement for use in driving a testbrush structure which is positioned in accordance with a coin deposit ina vending machine comprising a drive clutch mounted for rotation on oneaxis, means for moving said drive clutch along said axis in eitherdirection for engaging said test brush structure responsive to rotationin one direction and for disengaging said test brush structureresponsive to rotation in another direction, means for rotating saiddrive clutch in one direction responsive to the selection of an articlein said vending machine, and means for freeing said drive clutch andtest brush structure for independent rotational movement when the testbrush structure returns to a position conforming to the value of thearticle selected.

15. A coin change ascertainment arrangement for use in driving a testbrush structure which is positioned in accordance with a coin deposit ina vending machine comprising a drive clutch mounted for rotation on oneaxis, rotatable means normally engaging said drive clutch and rotatingsaid clutch in one direction responsive to the selection of an articlein said machine, a stationary stop arranged to thereafter engage saidclutch, a lever wall rotatably carried by said rotatable means for thenengaging said clutch to move said clutch along its axis and for thendisengaging said clutch from said stationary stop and rotatably engagingsaid test brush structure, and means for rotating said brush structuretowards starting position, means responsive to rotation of said brushstructure to cause said clutch to engage said stationary stop when thetest brush reaches a position conforming to the value of the articleselected, and means thereafter operatively responsive to the rotationalmovement of said test brush structure for disengaging the clutch andtest brush structure.

16. A coin change maker for use in a vending machine having articles ofvarious values and adapted to operate a test brush structure to aposition corresponding to the total coin deposit preparatory to vendingone of said articles, the improvement comprising means operated aftersaid deposit for engaging With and repositioning said test brushstructure to another position corresponding to the difference betweensaid coin deposit and .the value of said article, and means normal-1ybiasing said test brush structure for operation inone direction andarranged to automatically release said engaged means responsive to saidtest brush structure being in said other position.

17. A coin change maker for use in a vending machine having articles ofvarious values and adapted .to operate a test brush structure to aposition corresponding to the total coin deposit preparatory to vendingone of said ar ticles, the improvement comprising means operated forengaging with .and repositioning said .test brush structure to anotherposition corresponding to the difference between said coin deposit andthe value of said article and for thereafter disengaging from said testbrush structure, said means comprising a rotatable clutch arranged foraxial movement in one direction to engage said brush structure, meansnormally urging said clutch to move axially in another direction, meansfor driving said clutch in said one direction responsive to itsrotation, and means operated for rotating said test brush structure inanother direction responsive to it being in said other positionwhereupon said normally urging means is operated to move said clutch insaid other direction.

References Cited by the Examiner UNITED STATES PATENTS 2,459,008 1/49Tratsch 74-126 2,639,014 5/53 Manschauer 19267 2,684,741 7/54 Gregory19267 2,869,697 1/59 Mars-hall 19267 2,906,383 9/59 Gabriel 192672,923,165 2/60 Patzer 74126 LLOYD McCOLLUM, Primary Examiner.

MILTON O. HIRSHFIELD, Examiner.

17. A COIN CHANGE MAKER FOR USE IN A VENDING MACHINE HAVING ARTICLES OFVARIOUS VALUES AND ADAPTED TO OPERATE A TEST BRUSH STRUCTURE TO APOSITION CORRESPONDING TO THE TOTAL COIN DEPOSIT PREPARORY TO VENDINGONE OF SAID ARTICLES, THE IMPROVEMENT COMPRISING MEANS OPERATED FORENGAGING WITH AND REPOSITIONING SAID TEST BRUSH STRUCTURE TO ANOTHERPOSITION CORRESPONDING TO THE DIFFERENCE BETWEEN SAID COIN DEPOSITANDTHE VALUE OF SAID ARTICLE AND FOR THEREAFTER DISENGAGING FROM SAIDTEST BRUSH STRUCTURE, SAID MEANS COMPRISING A ROTATABLE CLUTCH ARRANGEDFOR AXIAL MOVEMENT IN ONE DIRECTION TO ENGAGE SAID BRUSH STRUCTURE,MEANS NORMALLY URGING SAID CLUTCH TO MOVE AXIALLY IN ANOTHER DIRECTION,MEANS FOR DRIVING SAID CLUTCH IN SAID ONE DIRECTION RESPONSIVE TO ITSROTATION, AD MEANS OPERATED FOR ROTAATING SAID TEST BRUSH STRUCTURE INANOTHER DIRECTION RESPONSIVE TO IT BEING IN SAID OTHER POSITIONWHEREUPON SAID NORMALLY URGING MEANS IS OPERATED TO MOVE SAID CLUTCH INSAID OTHER DIRECTION.